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  3. Chemistry
  4. The surface tension of water at 20°C is 73 dynes cm-1 The .minimum value of work done needed to increase surface area of water from 2 cm2 to 5 cm2 is

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Q. The surface tension of water at $20^{\circ}C$ is $73$ dynes $cm^{-1}$ The .minimum value of work done needed to increase surface area of water from $2 \,cm^{2}$ to $5\, cm^{2}$ is

States of Matter

Solution:

$w=\gamma dA=73\times3=219$ dynes cm